Carl Posner

He studied natural sciences and medicine at several German universities, receiving his PhD at Leipzig in 1875 and his medical doctorate at Giessen in 1880.

Afterwards, he settled into a medical practice in Berlin, and in the meantime, received training in urology as a private assistant to Ernst Fürstenheim (1836–1904).

He is remembered for his pioneer work involving testicular puncture biopsy in the investigation of infertility in humans,[2] as well as for the eponymous "Posner test", a means used for determining the presence of albumin in urine.

[3] In addition to his works associated with genitourinary subjects, he published a biography on pathologist Rudolf Virchow (1921) and an important study involving the lamellibranch gill, titled "Ueber den Bau der Najadenkieme.

[4][5] His other written efforts include: He was an editor of the journals "Berliner klinischen Wochenschrift" and "Zeitschrift für Urologie".